Body Fat Example (nknw260.sas) It is very cumbersome and expensive to obtain the body fat of individuals (submersion in water). Therefore, a prediction method is desired. This study is based on 20 healthy female subjects between the ages of 25 – 34. The study wants to decided if the amount of body fat (Y) can be predicted from triceps skinfold thickness (X1), thigh circumference (X2) and midarm circumference (X3).